# 5.2.4 Determining if a Value is Positive or Negative

Let’s try one last exercise, now that you are an expert!

## Activity: Positive or Negative?

Determine if each number in the given situation is negative or positive.

• 3 degrees below zero.
• 52 m below sea level.
• $1000 net gain. •$5000 withdrawal from ATM machine.
• $1000 deposit in savings account. • 3 kg weight loss. • 2 kg weight gain. • 80 m above sea level. • 37 above zero. •$2000 net loss. ### Discussion

Look for key words, like “below”, “above”, or “loss” and “gain.” The correct solutions have been sorted into a table below.

NumberPositiveNegative
3 degrees below zero
52 m below sea level52 m
$1000 net gain$1000
$5000 withdrawal from ATM machine$5000
$1000 deposit in savings account$1000
3 kg weight loss3 kg
2 kg weight gain2 kg
80 m above sea level80 m
37 above zero37°
$2000 net loss$2000

Now that we have looked at some examples of negative numbers and you have learnt how to represent them on a number line, we will move on to using negative numbers in calculations.

5.2.3 The Number Line Revisited

5.2.5 Addition and Subtraction on the Number Line